Xerox 7700DX - Phaser Color Laser Printer Service Manual page 320

9-290 Phaser 7700 Color Laser Printer Service Manual
Interpreting Solid Fill Test Prints
Non-uniformity in any one color may
indicate a problem with the developer or
print units. Light streaks in one color
indicate developer or debris blocking
the laser.
Dark streaks in one color indicate a
problem with the developer or print
units.
Repeating spots in one color indicate a
problem with the print unit.
Non-repeating spots in all colors
indicate problems with the transfer belt.
Things to look for:
Uniformity in each color
Streaks
Spots
Repeating spots
Any one weak color may indicate a
faulty developer, print unit, or first
transfer.
Weak colors may also be caused by a
defective high-voltage power supply.
If all colors are weak, this could
indicate a problem with the ADC or
second transfer systems.
S7700-289
"Worm tracks" or wrinkles may be
caused by the fuser.